Final answer:
Comparing vendor bids by considering various factors, conducting cost/benefit analyses, and using mathematical models to estimate costs is appropriate. Assuming the lowest bid is the best without this analysis is not.
Step-by-step explanation:
Assuming that the lowest bid is automatically the most reasonable would NOT be an appropriate action in analyzing vendor bids. A project manager should more comprehensively compare bids and consider several factors beyond just the price. This includes the reliability of the vendors, the quality of their equipment, and whether the bid meets all the technical specifications outlined.
Additionally, they should use mathematical models to estimate costs, conduct a cost/benefit analysis, consider marginal costs and benefits, and normalize costs for comparison purposes. A vendor's bid being the lowest does not necessarily mean it's the best choice for the company, especially when considering long-term effectiveness and efficiency of the equipment.